# Parallel Queries

"Parallel" queries are queries that are executed in parallel, or at the same time so as to maximize fetching concurrency.

## Manual Parallel Queries

When the number of parallel queries does not change, there is **no extra effort** to use parallel queries. Just use any number of TanStack Query's `createQuery` and `createInfiniteQuery` functions side-by-side!



```svelte
<script lang="ts">
  import { createQuery } from '@tanstack/svelte-query'
  
  // The following queries will execute in parallel
  const usersQuery = createQuery(() => ({ queryKey: ['users'], queryFn: fetchUsers }))
  const teamsQuery = createQuery(() => ({ queryKey: ['teams'], queryFn: fetchTeams }))
  const projectsQuery = createQuery(() => ({ queryKey: ['projects'], queryFn: fetchProjects }))
  ...
</script>
```





## Dynamic Parallel Queries with `createQueries`



If the number of queries you need to execute changes, you cannot use manual querying since that would break reactivity. Instead, TanStack Query provides a `createQueries` function, which you can use to dynamically execute as many queries in parallel as you'd like.




`createQueries` accepts an **accessor that returns an options object** with a **queries key** whose value is an **array of query objects**. It returns an **array of query results**:




```svelte
<script lang="ts">
  import { createQueries } from '@tanstack/svelte-query'

  const { users }: { users: { id: string }[] } = $props()
  const userQueries = createQueries(() => ({
    queries: users.map((user) => {
      return {
        queryKey: ['user', user.id],
        queryFn: () => fetchUserById(user.id),
      }
    }),
  }))
</script>
```




> When using TypeScript, an inline `select` written on a query object passed to `createQueries` can't infer its `data` argument from that same object's `queryFn` — it falls back to `unknown`. Annotate the `select` parameter explicitly, or define the query with the [`queryOptions`](../reference/functions/queryOptions.md) helper, to keep type inference. See [this known limitation](https://github.com/TanStack/query/issues/6556).